Which metal would flex more?

[magicniner]

I was kinda hoping not to spend £250K+ on a test rig to find out. Lol

Just looking for advice for people that work with metals what they thought.

And in giving dimensions and materials you are asking them to perform standard calculations based on set formulae which are easily found.
It isn't Rocket Science and if yo want to pay my hourly rate I will look up the equations and do the calculations for you.

Around 8 years ago I wanted to know about material thicknesses in cylinders for a variety of diameters and pressures and looked up the required mechanical engineering equations, if you were to ask this on a mechanical engineering forum I'd expect an "off the cuff" answer but generally speaking by asking this here you are just expecting someone else to do your work for you, and someone might, but without seeing their working how will you know if the answer is any good?